/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.category;

import static org.hisp.dhis.system.deletion.DeletionVeto.ACCEPT;

import java.util.Iterator;
import java.util.Map;
import lombok.RequiredArgsConstructor;
import org.hisp.dhis.system.deletion.DeletionVeto;
import org.hisp.dhis.system.deletion.IdObjectDeletionHandler;
import org.springframework.stereotype.Component;

/**
 * @author Lars Helge Overland
 */
@Component
@RequiredArgsConstructor
public class CategoryOptionComboDeletionHandler
    extends IdObjectDeletionHandler<CategoryOptionCombo> {
  private final CategoryService categoryService;

  // TODO expressionoptioncombo

  @Override
  protected void registerHandler() {
    whenVetoing(CategoryOption.class, this::allowDeleteCategoryOption);
    whenVetoing(CategoryCombo.class, this::allowDeleteCategoryCombo);
    whenDeleting(CategoryOption.class, this::deleteCategoryOption);
    whenDeleting(CategoryCombo.class, this::deleteCategoryCombo);
  }

  private DeletionVeto allowDeleteCategoryOption(CategoryOption categoryOption) {
    final String dvSql =
        "select 1 from datavalue dv "
            + "where dv.categoryoptioncomboid in ( "
            + "select cc.categoryoptioncomboid from categoryoptioncombos_categoryoptions cc "
            + "where cc.categoryoptionid = :coId ) "
            + "or dv.attributeoptioncomboid in ( "
            + "select cc.categoryoptioncomboid from categoryoptioncombos_categoryoptions cc "
            + "where cc.categoryoptionid = :coId ) limit 1;";

    if (exists(dvSql, Map.of("coId", categoryOption.getId()))) {
      return VETO;
    }

    final String crSql =
        "select 1 from completedatasetregistration cdr "
            + "where cdr.attributeoptioncomboid in ( "
            + "select cc.categoryoptioncomboid from categoryoptioncombos_categoryoptions cc "
            + "where cc.categoryoptionid = :coId ) limit 1;";

    if (exists(crSql, Map.of("coId", categoryOption.getId()))) {
      return VETO;
    }

    return ACCEPT;
  }

  private DeletionVeto allowDeleteCategoryCombo(CategoryCombo categoryCombo) {
    final String dvSql =
        "select 1 from datavalue dv "
            + "where dv.categoryoptioncomboid in ( "
            + "select co.categoryoptioncomboid from categorycombos_optioncombos co "
            + "where co.categorycomboid= :coId ) "
            + "or dv.attributeoptioncomboid in ( "
            + "select co.categoryoptioncomboid from categorycombos_optioncombos co "
            + "where co.categorycomboid= :coId ) limit 1;";

    if (exists(dvSql, Map.of("coId", categoryCombo.getId()))) {
      return VETO;
    }

    final String crSql =
        "select 1 from completedatasetregistration cdr "
            + "where cdr.attributeoptioncomboid in ( "
            + "select co.categoryoptioncomboid from categorycombos_optioncombos co "
            + "where co.categorycomboid= :coId ) limit 1;";

    if (exists(crSql, Map.of("coId", categoryCombo.getId()))) {
      return VETO;
    }

    return ACCEPT;
  }

  private void deleteCategoryOption(CategoryOption categoryOption) {
    Iterator<CategoryOptionCombo> iterator = categoryOption.getCategoryOptionCombos().iterator();

    while (iterator.hasNext()) {
      CategoryOptionCombo optionCombo = iterator.next();
      iterator.remove();
      categoryService.deleteCategoryOptionCombo(optionCombo);
    }
  }

  private void deleteCategoryCombo(CategoryCombo categoryCombo) {
    Iterator<CategoryOptionCombo> iterator = categoryCombo.getOptionCombos().iterator();

    while (iterator.hasNext()) {
      CategoryOptionCombo optionCombo = iterator.next();
      iterator.remove();
      categoryService.deleteCategoryOptionCombo(optionCombo);
    }
  }
}
